Apparatus for die casting articles



lNvEN-roR Fay E. MCI/7 fos/2 BY i ATTORNEYS Nov. 22, 1938. R E,MclNTOsl-l 2,137,539

APPARATUS FOR DIE CASTING ARTICLES Filed'Jan. 5o,A 1937 2 sheets-sheet 2INVENTOR Foy E. /V/c Infos/2 BY m AT'TokEYs l Patented Nov. 22, 1938PATEN'r` OFFICE 2,137,539 APPARATUS Foa DIE CASTING ARTICLES Roy E.McIntosh, New York, N. Y., assignor to Star Expansion Bolt Company, NewYork, N. Y., a corporation oi.' Illinois Application January 30, 1937,Serial No. `123,184

2 Claims.

This invention relates to an apparatus for die casting articles havinginternal threads therein.

More particularly stated, the invention relates to an apparatus for diecasting and vejecting from the die a group of articles, such as nuts,

internally threaded caps, or internally threaded expanding elements forexpansion anchors.

When such articles are to be cast, the mold has positioned therein athreaded core pin and the metal is forced under pressure into the moldand around the pin. In the methods heretofore used, after the castinghas set, the pin is threaded out of the article and the article isejected by an ejector pin or other 'suitable means which is usuallymoved through the core and forces the cast article from the die.

'Ihis invention has for its salient object to provide a simple andpractical apparatus for simultaneously withdrawing a core pin from thecast article and ejecting the article from the mold.

Another object of the invention is to provide simple and practical meanswhereby the opening of'a die casting mold or the removal of the diecover therefrom will automatically set in opera'- tion means whereby thecore pin will be removed from the mold and the article will be ejectedtherefrom.

Further objects of the invention will appear from the followingspecification taken in connection with the drawings which form a part ofthis application, and in which- Fig. 1 fis an elevational view ofapparatus constructed in accordance with the invention and adapted foruse in carrying out the method;

Fig. 2 is a sectional elevation through the die, the die being closed;

Fig. 3 is aviewsimilar to Fig. 2 but illustrating the die with the coverremoved and the die casting ejected; Y

l Fig. 4 is an elevational view of the die mold;

a'nd

Fig. 5 is an elevational view of the die casting formed in the mold.

The invention briiiy described consists of a i method of die casting aplurality of threaded articles in a group and of simultaneouslyseparating the core pins and articles and ejecting the casting from themold after the casting has set. The invention further consists inapparatus i for carrying out this method and in apparatus forsimultaneously opening the die and ejecting the casting therefrom: Y

Further details of the invention will appear from the followingdescription.

In the particular embodiment of the apparatus illustrated in thedrawings there is shown in Fig. l a machine comprising a base I Il onwhich is supported a die Il, the details of which are illustrated inFigs. 2 and 3, the die being closed by a cover I2. The molten metal forthe die is 5 forced under pressure from a receptacle or pot I3 through aconduit i4 into the die mold II.

'I'he cover I2 is held in closed position by a plunger I5 having a.piston I8 on one end disposed in a pneumatic .cylinder I1. A

The die mold II is constructed in the manner shown in Fig. 4, with agate 20 through which the molten metal enters the mold. The gate 20communicates with a groove 2| which `forms a conduit for conducting themetal around the l5 mold and to laterally extending -conduits whichcommunicate with the die cavities 23 in which the cast articles areformed.

-In each of the cavities 23 there is disposed a threaded core pin 24 andeach core pin has a 20 rearwardly extending spindle `25 formed thereon,

to which is secured a gear 26.

The gears 26 mesh with a centrally disposed- `gear 21 mounted on a shaft28 supported in vertically extending portions 29 and 30 of the base 25III. The front end of /the shaft 28 is mounted in ball bearings 3|.

A pulley is rotatably mounted on the shaft 28 and is driven in anysuitable manner, as by a belt 36. 'I'he pulley 35 forms `a ily wheel and30 has secured thereto a plurality of clutch pins 31 which are adaptedto seat in sockets 38 of a shiftable clutch member or yoke 39 which iskeyed to the shaft 28. When the clutch member 39 is shifted to the leftviewing Fig. l the pins 31 will 35 enter the recesses 38 and the shaftwill be driven by the ily wheel 35.

The clutch yoke 39 is engaged by a clutch shifting lever 40 pivoted on aiixed pivot 4I and having its lower end connected by a. link 42 to 40 alever 43. Lever 43 has a fork 44 at its lower end in which is positioneda fixed pin 45. The upper end of the Vlever 43 is pivoted at 4.6 to thdie cover or closure I2.

In order to facilitate the stopping of the shaft 45 28 when the clutchis thrown out, a brake 50 of any suitable construction is mounted on thebase III and frictionally engages a pulley 5I mounted on the left handend of the shaft 28 viewing Fig. l.

Operation When the casting is to be formed the parts are position by theplunger l5. The metal is then forced into the mold under pressure andthereafter the plunger l5 is moved to the right opening the die mold andat the same time shifting the clutch yoke 38 to the left, connecting they wheel 35 to the shaft 28. The y wheel is rotated in such a directionthat the gears 26 will be rotated in a direction to cause the rotationof the threaded core pins 26 to eject the castings from the molds orcavities 23. Thus, the core pins and castings will be separated and atthe same time the die casing will be ejected from the die.

Although one specic embodiment of the invention and one particular formof apparatus has been illustrated, it will be understood that changes inthe construction and in the arrangement of the various parts may be madeand that the method may be carried out by modied forms of apparatuswithout departing from the spirit or scope of the invention, asexpressed in the following claims.

What I claim is:

1. Apparatus of the character described comprising a stationary diehaving a plurality of mold cavities, means for closing the die,rotatable threaded core pins in the mold cavities in said stationarydie, means for rotating said pins in a direction to eject the castarticles from the mold cavities of the stationary die, means for movingsaid die closing means to open and closed positions, and means connectedto said moving means for setting said pin rotating means in operationwhen the die is opened.

2. Apparatus of the character described comprising a stationary die, aclosure for the die, rotatable threaded core pins in the die cavities ofthe die, a power shaft for rotating said pins in a direction to ejectthe casting from the die cavities of the stationary die, a clutchbetween the shaft and pins, means for opening and closing .the dieclosure and operative connections between said closing means and saidclutch so arranged that the clutch will be thrown in when the closureoperating means is actuated to open the die.

ROY E. MCINTOSH.

